你最好在旅游前制定一个计划。 You'd better make a plan before. 这个好心的小孩领着一个盲人过了马路。 This kind of child led a blind man across the road. 刚才我听到有人正在拉小提琴。 Just now I heard... someone playing the violin. Tom今天早晨知道他妈妈回来才起床。 Tom didn't get up until his mother came back this morning. 望采纳（=^ ^=)~